problem with dvd drives

ive had my computer for 7 months and yesterday i tried to put a cd in and nothing popped up so i went to my computer and no drives (besides my HDD) were listed. i went to device management and viewed the properties of my dvd drives and for both of then it said the drives were not loaded because they were missing or corrupt. any suggestions.

Restart in Safe mode and go into device manager. Uninstall all drives and reboot as normal. If no good I guess the drive is bad.
Things to try if you can - try the drive in another PC
Try another drive in your PC
Try another ribbon cable
As it is < 12 months old, get it replaced under warranty.